Percy r foster



2 Sheets-Sheet 1.

7 (No Model.)

P. R. POSTER.

STEAM ENGINE VALVE.

No. 398,777 /'/6./. Patented .26, 1889..

N. pnzns, mwum n m. Washington, no

(No Model.)

P.B,.I'OSTER. STEAM ENGINE VALVE.

2 Sheets-Sheet 2.

Patented Feb. 26, 1889.

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PERCY R. FOSTER, OF BROOKLYN, NEW YORK, ASSIGNO'R TO MARSHALL T. DAVIDSON, OF SAME PLACE.

STEAM-*ENGlNE VALVE.

SPECIFICATION forming part of Letters Patent No. 398,777, dated February 26, 1889.

Application filed June 26, 1888- To aZZ whom it may 0071 6677b.

zen of the United States, residing in Brooklyn, in the county of Kings and State of New York,

have invented certain new and useful Improvements in Steam-Engi ne Valves, of: which the following is a specification.

My invention relates to steam-engine valves, and more especially to the valves of that char acter of pumping-engine known as direct-acting duplex engines, composed of two separate and distinct engines capable of being coupled together through the medium of their valves; and my invention consists in the pe culiar construction and arrangement of the valves and their connections to facilitate the couplin and uncoupling of the same, as fully set forth hereinafter, and as illustrated in the accompanying drawings, in which- Figure l is a transverse section showing the steanrchest, cylinders, and connections of a direct-acting duplex engine, the two parts of which are marked, respectively, No. l and N o. 2. Fig. 2 is a side view of one of the engines. Fig. 3 is an enlarged section showing the steam-chests and connections. Fig. 4 is a longitudinal section through the auxiliary chest with the valve removed from its seat. Fig. 5 is a back view of the auxiliary valve and its ports. Fig. 6 is a bottom view of the main valve. Fi g. T is a longitudinal sect ion through the bottom of the main chest.

B B are the main-valve chests of a pair of engines, which valve-chests contain the main sliding and rocking valves A A, to which movement is given, as in the engine described in Letters Patent No. 155,728, granted to II. A. Jamison, October 6, 1874, and with each main-valve chest is combined an auxiliaryvalve chest, 0, containing an auxiliary valve, which operates in connection with the main valve, as does the auxiliary valve described in Letters Patent No. 293,243, granted to It. \V. Hamilton, February 12, 1881. The construetion and arrangement of the auxiliary valves in the present case, however, differ essentially from that described in the aforesaid patent to Hamilton. Thus there is a communication through. an upper port, f, and two lower ports, a a, between the interior of the main-valve chest and the interior of the sup- $erial No. 278,213. (No model.)

plemental valve-chest (f, the said ports extending to a fiatvalve-facc, 51', against which [its the flat semicircular valve B provided i with two ports, 12 n, which may be brought to coincide alternately with the ports a a. Each valve B ls secured to a sliding and rockin shaft, 6, extending through a stuffing box, m, and provided with an arm,f, and slotted to receive the end of a lever, E, by means of which the valve B may be brought againstits seat to control the passage of steam to the ports a a, or may be carried away from its seat to permit the free passage of the steam to said port, as in the valve described in the said patent of Hamilton.

The arms ff of the two engines are connected to be operated together from some mov ing part of said engine in the same manner shown in Fig. 1, as the supplemental valves are operated in the engine described in said patent to Hamilton. In working the engines independentlyas, for instance, the engine N0. 1when the same has completed its stroke, the main valve A is brought to a closed position and is also oscillated until the steamports a b and cove c coincide, as shown. Steam passes from the main chest through the ports f into the auxiliary chest 0, and thence by the above-mentioned ports and passages to either end of the main chest to operate upon the piston thereof and shift the valve, as will be well understood.

In working both the engines together the main valve A, having been brought to a closed position, as before, is prevented from further movement by the position of the auxiliary valve B which is upon its scat covering the steam-passages d a. Vhen the engine No. 2 has arrived at the central. position in its stroke, it rocks the auxiliary valve of engine No. 1 through the medium of its connections there with, and the port n is put in communication with the port a and cove c and the port l), thus admitting steam to the main-valve piston of engine No. 'hen the engine No. 1 is at the opposite end of its stroke, the valve 13 has been moved by engine No. 2 so as to bring the ports a a in communication with each other and with the cove 0, while the steam is exhausted through ports 71 and (Z and passage 9. hen either engine is to be thrown out of operative connection with the other, the leverE is shifted to carry the valve 1) of said engine from its seat, as shown in Fig. 2.

It will be seen that by the above-desoribed l rods upon which the said valves are mounted,

construction of auxiliary valve I am enabled to secure the same result as by the more complicated and expensive construction set forth in the before-said patent to Hamilton.

\Vithontlimiting myself to theprecise construction and arrangement of parts set forth, I elain1 faces and communicating with the mainvalves through steam-ports, the Hat valves B, fitted to the said valve-faces and provided with steam-ports, and sliding and oscillating substantially as set forth.

3. In a dupleX-ei'ig'inc, the combination of the auxiliary-valve chests having fiat valvefaces perforated to form the Si'GitlIl-1)()ltSf, a, and a, the Hat valves B fitted to the said i valve-faces below the ports f and covering the 1. In a duplex engine, the combination of auxiliary-valve chests having flat valve-faces and comnninicating with the main valve chests through ports, fiat-faced auxiliary valves fitted to the said valve-faces, to and from which they are adjustable, and provided I ports a and a, and provided with the ports 11 and n, adapted to be brought to register with the ports (r and a, and the sliding and oscillating rod upon which the valves are mounted, substantially as set forth. I

In testimony whereof I have sign ed my name to this specification in the presence of two subscribingwitnesses.

IERC Y R. FOSTER.

Vitnesses F. H. SAWTELLE, ANDREW R. BAIRD. 

